A GA PLT AT RWY INTXN TAKES A CLRNC MEANT FOR ANOTHER ACFT AND TAXIES IN FRONT OF AN ACFT MAKING TOUCH AND GO. THE CTLR DID NOT SEE THE ACFT TAXI INTO POS.

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MISIDENT OF ACFT THROUGH INADVERTENT MISINFO PROVIDED BY FLC LED TO THE CTLR ISSUING INSTRUCTIONS TO AN OBSERVED ACFT. THE UNOBSERVED ACFT ACKNOWLEDGED FIRST HOLD SHORT; LNDG TFC. AFTER ARRIVING TFC BEGAN TKOF ROLL OBSERVED ACFT BELIEVED TO BE ACFT WAITING DEP WAS ISSUED POS AND HOLD. ACFT ACTUALLY MAKING DEP REQUEST WAS AT AN INTXN 4200 FT DOWN-FIELD UNOBSERVED. THE ACFT DID NOT REQUEST DEP FROM THE INTXN. FIRST ACFT DID TOUCH AND GO OR STOP AND GO. SECOND ACFT TAXIED INTO POS BEHIND PRECEDING DEP; STILL UNOBSERVED BY THE CTLR. BE23 ADVISED 'TWR DID YOU SEE THAT? THAT GUY WENT BEHIND US; THAT WAS CLOSE.' PA32 ADVISED 'TWR YOU GAVE US POS AND HOLD THEN THIS GUY WENT IN FRONT OF US.' PA32 PLTS ADVISED DURING SUBSEQUENT INTERVIEW THAT THE BE23 WAS OBSERVED TO BE LNDG AND THOUGHT TO BE TURNING OFF IN FRONT OF THEM. PLTS OF PA32 QUERIED ABOUT THEIR REQUEST FOR DEP AND DID THEY HAVE THEIR ACFT LIGHTING ON. THEY REPLIED THAT THEY 'THOUGHT SO.' WHEN THEY WERE ASKED HOW CLOSE THE 2 ACFT GOT; THEY REPLIED 'WE SAW HIM; IT WAS NO BIG DEAL.' PLTS WERE INFORMED THAT FURTHER INVESTIGATION WAS THEIR OPTION AS THE BE23 FINISHED ADDITIONAL PATTERN WORK; WISHED THE TWR 'GOOD NIGHT;' MADE NO REQUESTS OR INQUIRIES. EVEN THOUGH ALL DEP POINTS WERE SCANNED THE ACFT AT THE INTXN WAS NOT OBSERVED. HAD THE WORD 'INTXN' BEEN USED OR POS AND HOLD AFTER DARK REGS BEEN UNDERSTOOD BY THE PA32 PLTS (THEY WERE UNAWARE THAT POS AND HOLD AFTER DARK AT AN INTXN IS NOT AUTH); THEY WOULD HAVE RAISED A VERIFICATION. ATC HAS BEEN EDUCATED TO THIS RULE; HAVE THE PLTS?